Radio receiving set



Feb. 20, 1951 R. BRENTA 2,542,793

RADIO RECEIVING SET ROBERTO BRENTA BY' www,

ATTORNEY 4 Sheets-Sheet 2 INVENTOR.

ROBERTO BRENTA ATTORNEY R. BRENTA Feb. 20, 1951 RADIO RECEIVING SET Filed May 26, 1948v 49 Haw, A

Feb. 20, 1951 R. BRENTA 2,542,793 I RADIO RECEIVING SET Filed May 26, 1948 4 Sheets-Sheet 3 FIG.6.

FIG. 8.

IN V EN TOR.

ROBERTO BRENTA Feb. 20, 1951 R. BRENTA RADIO RECEIVING SEI Filed may 2e, 194s 4 Sheets-Sheet 4 nih. Y

IN VEN TOR. ROBERTO BRENTA TTORNE'Y Patented Feb. 20, 1951 RADIO RECEIVING SET Roberto Brenta, New York, N. Y., assignor of fty per cent to Jack Schneider and fifty per cent to Carmella Serraro Brenta, both of New York,

Application May 26, 1948, Serial No. 29,242

3 Claims.

This invention relates to the manufacture, construction and maintenance `of radio receiving sets and the like.

.An object of the invention is to provide an improved form of radio receiving set construction whereby certain pre-determined electrical components of the set are connected into their respective circuits by novel `means .so that said components are easily detachable v.for inspection or repair or replacement Without breaking soldered connections and without the use of tools.

Another object of the invention is to provide an improved form of radio receiving set construction, in which a number of pre-determined electrical components of the set are all mounted upon a unitary frame, each component being connected to individual terminals of Vsaid frame, and the frame being adaptable for engagement with the chassis of the receiver to `automatically internose said electrical components into the electrical circuit thereof.

A further obiect of the invention is to provide a novel radio receiving set construction in which all the resistors and capacitors of the circuit thereof are mounted upon a panel and permanently connected to rindividual terminal clips on the panel, and in which mating terminal clips are mounted upon the receiver chassis and connected to the remaining circuit elements such as the tubes, power supply, loud speaker and the like, whereby the panel 'bearing the said resistors and capacitors may be quickly snapped into electrical engagement with said mating terminal clips to directly interpose said elements mounted on the panel into the receiver circuit, and whereby, for service, repair or replacement, the entire said panel may be readily unsnapped from said engagement for entire replacement, or for rapid service of individual resistors and capacitors mounted thereon.

Still another object of the invention is to provde a novel receiver construction in which circuit elements such as the loud speaker assembly and the variable condenser assembly are provided with unitary insulated panels upon which they are mounted, the circuit elements being permanently connected 'to electric terminals mounted on the panels, with corresponding mating terminals mounted on the receiver chassis vfor electrical engagement therewith, and including means for securing said panels to said chassis independently Vof said terminals.

A further object of the invention is to `provide a novel form of receiver construction, as described, which .is simple .in design, Ainexpensive to VIt() manufacture, and which makes for rapid inspection and servicing of radio receivers at low cost, thereby encouraging users to have their receivers repaired rather than replacing the entire receiver due .to the normally high cost of repair under prior art construction.

Other obiects and advantages of the invention will become apparent from the following description of a preferred embodiment thereof as illustrated in the accompanying drawings, and in which,

Fig. 1 is a bottom plan view of a radio receiver chassis according to my invention,

Fig. 2 is a View similar to that of Fig. 1, but with my resistor-capacitor replacement panel dismounted therefrom,

Fig. 3 is a plan view of my novel resistorcapacitor replacement panel apart from the receiver chassis, and showing the opposite side thereof from that shown in Fig. 1,

Fig. 4 is a fragmentary top plan View of a radio receiver chassis according to my invention, illustrating particularly the invention With relation to easily repaceable loud speaker and variable condenser units,

Fig. 5 is a fragmentary right side elevation as viewed along line 5-5 of Fig. 4,

Fig. 6 is an enlarged sectional view taken substantially along the line 6 6 of Fig. 4,

Fig. 7 is an enlarged sectional view taken on line 7-1 of Fig. 1,

Fig. 8 is an enlarged detail sectional view taken on line 8--8 of Fig. 1, and

Fig. 9 is a schematic circuit diagram of a radio receiver embodying my invention.

In the construction of radio receivers, it is customary to solder lead wires to interconnect the various circuit elements, permanently to those elements, all these elements being thus permanently interconnected by soldered joints except the receiver vacuum tubes themselves. As la result, those elements, such as resistors and capacitors, which, aside from the vacuum tubes themselves, are most frequently apt to give trouble, as well as the variable condensers and loud speaker, cannot be inspected or disrnounted from the chassis frame Without considerable difficulty and annoyanceV Consequently the cost of repair or even of inspection of a receiver to determine the location of the `trouble has become quite high. By means of the present invention, it is possible to snap out of the receiver all the trouble-giving components, either for inspection, or for replacement of the 3 entire assembly, so as to eliminate the trouble, and make the receiver function immediately.

In order to understand clearly the nature of the invention, and the best means for carrying it out, reference may now be had to the drawings, in which like numerals denote similar -parts throughout the several views.

' As shown, the radio receiver includes a chassis base 39 made of steel, aluminum or other suitable sheet material, and having depending front and rear walls 32 and 34. Mounted with rivets or otherwise upon the underside of the platform or base 3D, as seen best in Fig. 2, area number of vacuum tube sockets 38, in alignment or registry with corresponding openings formed in the base 39 to permit insertion from above the base 3|! of vacuum tubes 38 through the openings and Y into the tube sockets in the usual manner.

Coil sockets 49 are similarly secured to the underside of the chassis platform 3|) in registri with openings formed therein, to permit insertion from above the base 3|! of the contact prongs or plugs of hollow cans 42 containing tuning coils and trimmer condensers into said coil sockets. The cans 42 are well known in the art and hence will not be otherwise described in detail, except to mention that they form shields about the enclosed coils and trimmer condensers, and are employed for various purposes in the radio circuits, such as intermediate freouency transformers and the like. The tube sockets 36 and the coil sockets 4S! are connected into the radio circuit by means of Yinsulated wires 44 so that the various circuits are made continuous in the manner well knownY in the art.

Fig. 9 shows a typical superheterodyne radio receiver circuit including tubes and power supply adapted for connection to the electric power lines by means of wires 46 and 48. A combined line switch and potentiometer type volume control 59 is supported upon the front chassis wall 32 with its shaft 52 extending through an opening formed in the wall and is secured in position by means of a nut 54 threaded onto the outer end of the shaft bushing 59. The electrical connections of the switch and volume control 5|! are shown in the schematic diagram of Fig. 9, at two locations marked 5G, and it is connected into the circuit by means of insulated wires such as those shown at 58.

An antenna loop 60, comprising a number of turns of wire wound on a fibre form, is supported upon a loop bracket 52 secured to the rearward chassis wall 34 by means of screws 64, the loop being connected into the circuit by means of wires such as those shown at S6 and 68 in the manner shown in Fig. 9. From examination of the schematic circuit diagram in Fig. 9, it will be seen that there are numerous other circuit elements and components, such as oscillator coil 1li, xed capacitors '12, '14, `'16, 18, 80, 82, 84, 86 and electrolytic capacitor 88. These are mounted upon one surface 89 of a removable plate or platform et formed of insulating sheet material.

Also mounted on the same surface of the removable plate 96 are other circuit elements, such as the xed resistors 92,512,234, 96, 98, HiB-and |32. In View of its greater bulk, the dry type electrovlytic condenser 38 is set into an opening |94 elements such as resistors and capacitors are 90nnected to these contact rivets |36 by means of wires, as shown in Fig. 3. In Fig. 1, the rivets H35 themselves are clearly visible upon the underside |i8 of the removable plate 9i);

These mutually insulated Vrivets H35 thus serve to support firmly, many of the circuit elements the leads of which are soldered'thereto, in the manner of Fig. 3.- As shown best in Figs. l, 3, 7 and 8, the removable plate 99 is also provided Yalong its edges ||0 and H2, with a number of vU-shaped spring contact lugs ||4, which are secured to the plate by means of rivets IIS in the manner best shown in Figs. '7 and 8, so as to hold the contact lugs I I4 securely in position.

The contact lugs'i i4 may be conveniently nurnbered as shown in Fig. 3, from l to 20 where 20 such lugs are used. It will be seen, from Fig. 3, that some of the circuit elements, such as the oscillator coil 'lil and the electrolytic condenser 88 have one or more of their terminals soldered or otherwise connected directly to certain of the marginal contact lugs ||4 which thus serve to provide direct support for them on the plate 90.

As shown best inrFig. l, it will be seen that further interconnection between any selected contact rivets 96 and/or any selected marginal lugs H4, may be made by means of wires |213 on the reverse side ,of the plate 99. In this manner, any desired degree of circuit element interconnection may be accomplished.

The contact lugs ||4 on the plate 90 are adapted by location along the margins of the plate 9U, for conductive engagement with iiexible spring clips or sockets |22 which correspond in number and position to the contact lugs H4. However, the stationary spring clips S22 are carried upon two parallel strips |24 and |26 of insulating material extending almost the full length from left to right of the'chassis 30 as seen in Figs. 1 and 2 to underlie the marginal edges-of the removable plate 90. Each of these insulating strips |24 and |26 is secured to the underside of the chassis platform 30 by means ofi."V

shaped brackets |28 secured to the parts by means of screws or rivets |30 and |32. From Figs. 1 and 2, 7 and 8, it will be seen that the brackets |28 are only secured to the insulatingr strips |24 and |25 at their ends, so there is no direct connection through this means between the chassis 30 and any of the spring socket clips |22.

The brackets 28..may be of steel, whereas the shanks |34 of the spring socket clips |22 are of resilient material such as spring steel or brass or copper alloy, so as to yield readily to their dotted line positions shown at |36 in Fig. 7,

when the plate lugs |4 are snapped into position as shown, each opposite pair of plate lugs H4 being thus snapped into engagement with the corresponding pair of oppositev socket clips I 22, so that the plate S is securely held in position.

In this manner, not only is the plate 90 supported rmly as illustrated, but each plate lug ||4 on the plate Sil is in electrical connection with its mating socket clip |22 on the insulating strips |24 and |26. Since the stationary socket clips |22 are connected by means of wires such as those shown at |40 in Fig. 2, to various of the radio circuit elements in accordance with the cir.- cuit diagram of Fig. 9, it is obvious that quick 0 connection and disconnection of the circuit components mounted on the plate 90 with the other circuit components mounted on the chassis is easily effected by merely snapping the movable plate 90 into position or unsnapping it from engagement with the stationary socket clips |22.

By this simple means, therefore, :it is apparent that those circuit elements usually most prone to trouble, that the resistors, Lcapacitors and oscillator coil, are Aall ,mounted on a single insulated plate for removal at any time for inspection. And this may be accomplished without use of any Atools Vor the like, and Without breaking any soldered connections. Similarly, if trouble exists, the entire plate 90 with the elements mounted thereon, may be Yreplaced to cure the trouble, at low cost, it being sometimes cheaper to replace the entire plate 90 than to test individual elements of a conventional type set to determine the trouble.

According to the invention, other main circuit components may also be replaced without trouble. Such elements may be the loudspeaker assembly including the loudspeaker |50 and matching transformer |52, shown in Figs. 4 and 6. The magnetic yoke frame |54 of the loudspeaker has secured to its underside by means of rivets |56, an insulating terminal strip or plate |58 having lugs |60 secured thereto and mutually insulated. The terminals of the matching transformer and the voice coil of the loudspeaker are connected by wires |62 to these lugs |60.

A similar insulating strip or plate |64 is secured by rivets |66 to the chassis platform 30 as seen in Fig. 6. and has mounted thereon four stationary socket spring clips |68 by means of rivets or the like, in positions corresponding to the movable lugs |60 on the other plate when placed against each other, so as to make contact `with the mating lugs and clips to complete the circuits to the loudspeaker. To hold the fixed and movable insulating plates |58 and |64 Y in mating engagement with their corresponding electrical contacts interconnected, I prefer to employ one or more screws or bolts |10 extending through aligned openings in the insulating plates and/or the abutting metal parts, as in Fig. 6.

In a similar manner, as shown best in Figs. 4 and 5, the variable tuning condensers |12 may also be mounted for ready removal from the circuit. Thus, the frames |14 of the condensers have secured to their undersides by rivets or otherwise, insulating plates |16 carrying terminals |18 and |80 connected to the condensers by wires |82. Matching insulating plates |84 are secured. to the upper surface of the chassis platform 30 by rivets or otherwise, and have socket clips |86 carried thereon and interconnected with the receiver circuit by means of wires |88. Grounding is effected by direct connection to the chassis by means of the screws |90 extending be tween the chassis platform and the condenser frame, and holding the condenser in position, with its contacts |18 and |80 in electrical connection with the corresponding mating stationary contacts on the plate |84.

In this both the loudspeaker and the variable condensers may he readily connected or disconnected without breaking any soldered connections, either for inspection and repair, or for replacement.

It is thus apparent that I have devised a type of radio receiver construction which is quite simple for both connection and disconnection of the more important circuit elements. Hence servicing of the radio receiver is possible at low cost and without delay.

Although I have described a preferred embodiment of my invention in speciiic terms, it is to be understood that various chances may be ma de in size, shape, materials and arrangement without departing from the spirit and scope vof the invention.

I claim:

l. A radio receiver comprising -a plurality of radio circuit elements, a chassis, some of said radio circuit elements being mounted on said chassis, a secondary support plate, means for supporting said secondary support plate upon said chassis so as to be readily engageable and disengageable therewith, some other of said radio circuit elements being mounted on said secondary support plate, means carried jointly by said chas- ;sis and -said secondary 4support plate yfor eiecting ready electrical connection and disconnection of the circuit elements carried on said plate with the rest of the circuit, said secondary support plate being adapted to overlie a portion of the receiver chassis, a plurality of iixed main contact lugs secured to said secondary support plate and interconnected individually with selected numbers of said circuit elements carried on said secondary support plate, a plurality of mating contact sockets carried by and insulated from said chassis, and adapted to engage with said corresponding main contact lugs to effect electrical interconnection therewith, said mating contact sockets beine electrically interconnected with the circuit elements on said chassis according to the schematic hookup of the particular radio receiver, whereby quick and easy connection and disconnection of the circuit elements on the plate may be effected.

2. The construction according to claim l, characterized further in that said chassis carries secured thereto a plurality of insulated strips, said mating contact sockets being secured to said insulated strips and interconnected with said electrical circuit of the radio receivery and said xed main contact lugs on the said plate are constructed and arranged for good electrical connection with their said mating contact sockets.

3. A radio receiver comprising a plurality of radio circuit elements, a chassis, some of said radio circuit elements being mounted on said chassis, a secondary support plate, means for supporting said secondary support plate upon said chassis so as to be readily engageable and disengageable therewith, some other of said radio circuit elements being mounted on said secondary support plate, and means carried jointly by said chassis and said secondary support plate for efecting ready electrical connection and disconnection of the circuit elements carried on said plate with the rest of the circuit, said secondary support plate being adapted to overlie a portion of the receiver chassis, a plurality o xed main contact lugs secured to said secondary support plate and. interconnected individually with selected members of circuit elements carried on said secondary support plate, a plurality of mating contact sockets carried by and insulated from said chassis, and adapted to engage with said corresponding main contact lugs to eiect electrical interconnection therewith, said mating contact sockets being electrically interconnected with the circuit elements on said chassis according to the schematic hookup of the particular radio receiver', whereby quick and easy connection and disconnection of the circuit elements on the plate may be effected, said chassis having secured thereto a plurality of brackets, at least one insulating strip secured to at least one of said brackets, a plurality of mating contact sockets secured to each of said insulating strips and in position to mate with one of said main contact lugs on the said secondary support plate to effect electrical connection therewith, whereby said secondary support plate may be quickly and easily engaged with and disengaged from the said receiver chassis, and simultaneously eiecting electrical engagement or disengagement of the electric circuit components carried by said secondary support plate from and with the radio receiver elements carried by said chassis.

ROBERTO BRENTA.

REFERENCES CITED The following references are of record 1n the le of this patent:

8 UNITED STATES PATENTS Number Name Date 2,268,619 Reid June 6, 1942 FOREIGN PATENTS Number Country Date 236,261 Great Britain June 29, 1925 OTHER REFERENCES Tele-Tech Magazine, October 1947, article entitled: Heres the all plug-in receiver, page 57. 

